refactor: 更新 CheckRssJob 函数以每30分钟执行一次 RSS 检查，增强定时任务的灵活性和准确性

handler/rss/job.go

@@ -26,10 +26,10 @@ func CheckRssJob() {
 	//每个整5分钟执行一次
 	for {
 		now := time.Now()
-		if now.Minute()%5 == 0 {
+		if now.Minute()%30 == 0 {
 			go CheckNewRss()
 		}
-		nextAwake := 5 - now.Minute()%5
+		nextAwake := 30 - now.Minute()%30
 		time.Sleep(time.Minute * time.Duration(nextAwake))
 	}
 }